#c{
  margin: 100px auto;
  border: 1px solid #f00;
}
.canvas-container{
  margin: 0 auto;
}
.main{
  display: flex;
  justify-content: space;
  align-items: center;
}
.opera{
  padding: 20px;
}
.opera-item{
  display: flex;
  align-items: center;
  padding: 5px;
}
.opera-item-title{
  width: 100px;
}
.tips{
  font-size: 12px;
}
.opera-item-btn{
  background: coral;
  padding: 5px 20px;
  color: #fff;
  cursor: pointer;
  border-radius: 3px;
  margin: 5px;
}